Algebraic totalizer



1936. o. J. SUNDSTRAND @LGEBRAIC TOTALIZER Filed July 5, 1934 35INVENTOR Osmr J ,fwzdsfmfld TTORNEY Patented Oct. 13, 1936 UNITED.STATES PATENT OFFICE Amnnmc 'ro'rmzna Oscar J. Snndntrand, Bridgeport,Com, assignor to Underwood Elliott Fisher Company, New York, N. Y., acorporation of Delaware Application July 5, 1934, Serial No. 102,730

3 Claims.

The invention relates to computing machines and more particularly toadding and subtracting totalizers therefor.

In the so-called direct subtraction type of calculating machine, anerror of one occurs, when the totalizer moves from a positive to anegative condition,-in the accumulation of subtractiveamounts.Similarly, when the totalizer is operated for the accumulation ofpositive amounts so as to cause its condition to change from negative topositive character, the total represented by the positions of therespective wheels of the totalizer will be one less than the truepositive total.

In machines of the class under consideration the error above describedis corrected by the introduction of a fugitive one, it being understoodthat the fugitive one is introduced either subtractively, or additively,dependent upon whether the total standing in the totalizer is of anegative or positive character.

The present invention has for its object the provision of new andimproved means for automatically effecting the introduction of thefugitive one.

In theaccompanying drawing Figure 1 is a fragmental perspective view 'ofone form of machine embodying the features of my invention.

Figure 2 is a detailed sectional view of some of the parts shown'inFigure 1.

Figures 3 and 4 are elevational views of certain parts shown inassembled relation in Figures 1 and 2.

Figure 5 is a side elevation of both the adding and subtracting racksand the separate transfer mechanisms therefor. I

The invention is herein exemplified in connection with mechanism of thegeneral character disclosed in the Sundstrand Patents Nos. 1 ,198,- 487,1,481,487, -1,583,102, and in my co-pending application Serial No.118,628 filed June 26, 1926, (corresponding to French Patent No.625,678) and my application Serial No. 670,665 filed ctober 25, 1923,(now Patent No. 1,965,611);

Reference may be made to the above-mentioned patents and application foran understanding of features not fully illustrated or described herein.

pinions of intermediate orders may be utilized, each such pinion ofintermediate order being journaled for free rotary movement on the shaft10, and spaced apart, one from the other, by bushings l3.

As is typical of the Sundstrand machine, the totalizer shaft III ismounted for bodily movement forward and rearward of the machine inhorizontal slots ii in side walls It and I of a totalizer-supportingframe.

Such bodily movement of the totalizer shaft is effective to engage thetotalizer pinions with either one of two sets of actuating racks. Onesuch set of racks is arranged to rotate the pinions of the totalizer ina. clockwise direction as viewed in Figure 5, for the accumulation ofadditive amounts, whereas the second set of actuating racks is effectiveto rotate the pinions in a counter-clockwise direction for theaccumulation of subtractive amounts. The adding set of actuating racksis represented in the present instance by the rack 'l6 and the set ofsubtracting racks by the rack l1.

As is fully disclosed in the before-mentioned Sundstrand patents andapplication, the respective sets of adding and subtracting racks are Itshould, however, be understood that the present invention is not limitedto machines of the Sundstrand type.

Referring to the drawing, a totalizer shaft is indicated at Ill, atotalizer pinion of lowest denominational order at H, and a totalizerpinion of highest denominational order atl2. It will be understood thatany desired number of arranged to be elevated differential distancescorresponding to the amounts set up on the keyboard, as an incident to acyclic operation of the machine.

Prior to theupstroke of the racks in an accumulating cycle, thetotalizer is'moved to a neutral position intermediate the two sets ofracks and just prior to the downstroke of the racks the totalizerpinions aremeshed with whichever set of racks is to be used in theaccumulating operation.

It will also be understood that in a total taking operation thetotalizer pinions are meshed with the selected set of racks during theupstroke oi. the latter. Theracks areconnected to type bars 35 (Fig.

'5) an adding and a subtracting rack being associated with each type barby pin and slot connections' permitting of one step of movement of eachrack relative to the type bar to which it is articulated. The severalracks are guided for vertical movement in slots l8 (Fig. 1), formed onthe inwardly facing surfaces of a pair of similar bars l9 (Fig. 5),which extend longitudinally of the,totalizer and are supported in theside walls I and I5 of the totalizer-supporting frame.

Each rack has integrally formed therewith 9, lug 20, which moves in thevertical plane of its respective bar l9, and is arranged to be arrestedthereby to define the extreme downward position of the racks.

Transfer mechanism of any desired form may be employed.

8 In the present disclosure, similar rods 2| are carried in the sidewalls l4-l5 in spaced parallel relation at opposite sides of the twosets of racks. These rods operatively support a plurality of stop pawls22, one such pawl being provided 10 for each adding and subtractingrack. A stop lug 22 is formed integrally with each of the respectivestop pawls in a position to coact with the lugs 20 on the respectiveracks to support the latter one step of movement above the bars l9.

To the lower end of each stop pawl 22 is pivoted a dog 24, having atooth 25 to engage the edge .of the adjacent bar is.

'The means for disengaging the tooth 25 from the bar I 9 consists of twodiametrically opposite lugs 28, fixed to one side of eachpinion. Whenthe amount registered by a pinion reaches 9, continued rotation ofthe'pinion as its rack descends brings one of the lugs 26 against theend of the dog 24 associated with the next higher rack,

25 thereby depressing the dog until its tooth 25 is clear of the bar It,whereupon a spring 21 (assisted by the downward pressure of the spring I1a of the said next higher order rack) moves the dog and the pawl 22away from the last men- 80 tioned rack, the latter then, moving down onetooth space where it is stopped by contact of its lug 22 with the barIt. All of the beforemen tioned features are common to the Sundstrandpatents and application hereinbefore enumerated 85 and reference may behad to them for a more complete description of the functions and operation of the several parts concerned.

The rack ll of highest order is shown in the drawing as supported by thelug 23 of apawl 22. 40 That lug is withdrawn by the spring 21 when thetransfer dog 24 pivoted to said pawl is tripped by a lug 22 on thepinion of next to highest order, in

the operation of carrying from the next to the highest order to thehighest order.

as The lugs 28 on the pinion of highest order perform no useful functionin accumulation, but function in total-taking by stopping against theunder side of the end of a transfer dog 24.

Means is provided to advance the pinion ll of so lowest order, adistance corresponding to one unit, in either an adding or subtractingdirection, as an incident to a passage of the pinion l2 of highest orderthrough zero.

Tothis end the. pinion l2 of highest orderis non-rotatably secured tothe shaft II and the latter element in turn is provided with meanselective to displace the dog 24 associated with the rack I! of unitsorder so as to permit that rack to move downwardly one unit of distanceso and thus rotate the units pinion l I a corresponding amount.

In the present instance, the pinion i2 is fixed against rotation withrespect to shaft ll through the medium of a plate 22, arranged to bekeyed as to the shaft II by means of spaced arms 2! which engage'parallel key surfaces formed in the body of shaft lil normally of itsaxis. As will be seen from Figure 2, the pinion I2 is secured to theplate 2! by means of a coupling pin 24.

70 The dogs 24, associated with the adding and subtracting racks ofunits order, are arranged to be displaced by the rotary movementcommunicated to shaft ill by highest order pinion i2.

To this end, an irregularly shaped plate II is I. keyed to the shaft IIat theleftof thepinion ll of units order (as viewed in Figure 2). Spacedarms 32, formed integrally with the plate 3| are arranged to engagediametrically opposed paral lel key surfaces formed in the shaft ID. Aspacing washer 32 separates the pinion of lowest order from plate 2|, toinsure freedom of rotation of the pinion with respect to the plate.

The plate 3| includes a pair of fingers 34, which extend radially of theaxis of shaft i0, when the parts are in assembled relation. The fingers84 rotate in the plane of the dogs 24 of units order so as to displacethe latter as the pinion of highest order passes through zero in eitheran adding or subtracting operation.

It will be evident that I have provided a new and improved means toeffect the introduction of the fugitive one in the pinion of lowestorder of an algebraic totalizer as an incident to a passage of thepinion of highest order through zero.

I claim as my invention.

1. In a machine of the class described, a totalizer shaft, totalizerwheels mounted thereon, the wheel of highest order being securedthereto, two sets of actuating racks located on opposite sides of thewheels, a separate set of transfer mechanism for use with each set ofracks, a plate secured to the shaft adjacent the wheel of lowestdenomination and having two teeth, means controlled by ,one of the teethto enter a unit in the totalizer in one direction when the wheel ofhighest order is turnedthrough zero by one set of racks either throughitem entry or transfer and means controlled by the other tooth to entera unit in the totalizer in the other direction when the wheel of highestorder is turned through zero by the other 35 set of -racks eitherthrough item entry or transfer.

. 2. I". a machine of the class described, a totalizer shaft. totalizerwheels mounted thereon, the wheel of highest order being rotatable withsaid shaft, 40 two sets of actuating racks located on opposite ,sides ofthe wheels, a separate set of transfer mechanism for use with each setof racks, a plate secured to the shaft adjacent the wheel of lowestdenomination and having two teeth, means controlled by one of the teethto enter a unit in the totalizer in one'direction when the wheel ofhighest order is turned through zero by one set of racks either throughitem entry or transfer and means controlled by the other tooth to entera unit in the totalizer in' the other direction when the wheel ofhighest order is turned through zero by the other set of racks eitherthrough item entry or transfer.

3. In a machine of the class described, a totalizer having a pluralityof rotatable wheels, a part rotated in coordination with the wheel ofhighest order and, extending through the hubs of the other wheels, twosets of actuating racks located on oppomte sides of the wheels, aseparate set of 50 transfer mechanism for use with each set of racks, anelement carrying two teeth and located ad- :Iacent the wheel of lowestdenomination, the element being connected for movement by the said part,means controlled by one of the teeth to 55 enter a unit in the totalizerin one direction when the wheel of highest order is tur d through zeroby one set of racks either throug item entry or transfer, and meanscontrolled by the other tooth to enter a unit in the totalizer in theother direc- 7 tion when the wheel of highest order is turned throughzero by the other set of racks either through item entry or transfer.

OSCAR J. BUNDSTRAND.

